1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
jonny [76]
3 years ago
8

Can anyone help me with this last question?

Physics
1 answer:
Digiron [165]3 years ago
6 0

Answer:

v = 39.6 m/s (first answer option)

Explanation:

Use conservation of mechanical energy.

The starting is completely potential energy and the final is all kinetic energy:

m*g*h=\frac{1}{2}*m*v^2\\g *  h=\frac{1}{2} v^2\\9.8*80=\frac{1}{2} v^2\\v^2=1568\\v\approx 39.6\,\,m/s

which agrees with the first answer shown.

You might be interested in
Sophia is planning on going down an 8-m water slide. Her weight is 50 N. She knows that she has gravitational potential energy (
RideAnS [48]

Answer:

Explanation:

graph would be a straight line from (0, 0) to (400, 8)

Plot points are

PE = mgh

50(0) = 0 J

50(2) = 100 J

50(4) = 200 J

50(6) = 300 J

50(8) = 400 J

4 0
2 years ago
I don't understand any of this please help !
OlgaM077 [116]
You can see what is the electron configuration by looking at the layout of the periodic tables. the first shell will have a max of 2 electrons on it, once the first one is filled up a second is added with a max of 8 electrons on it and so on with the 8 as a max. so He, and H will only have them on the first shell but every horizontal row is a new valence or outer shell. so lets say for carbon look at the number in the upper left corner of the box will tell you the total number of electrons you will need. so start off with the first two electrons on the first shell. now you know that carbon needs 6 electrons in total, since you can only have a max of 2 on the first shell you need a second one so on the second one you will have to have the remaining 4. now elements are most stable when they have a full valence shell becuase those are the only electrons that will react with others. so if carbon has 4 it wants to either gain or lose 4 electrons so you could say that it would bond with 4H since each H will donate 1 electron to the C valence shell making all the H and C stable. CH4(methane)
6 0
3 years ago
What is one way to increase the amplitude if a wave in a medium?
Gekata [30.6K]

Answer: c

Explanation:

3 0
3 years ago
Constant speed is the same thing as average speed
larisa86 [58]
No, they have different definitions
4 0
2 years ago
Two friends are walking on a hot beach on a hot summer day. one friend reports her feet are becoming hot she needs her sandals.
nata0808 [166]

Answer:

conduction

Explanation:

6 0
3 years ago
Other questions:
  • A reaction that absorbs 49.6 kj from the surroundings in a vessel that undergoes a volume decrease of 1.25 l at a constant 4.00
    8·2 answers
  • Which of earths layers is made up of liquid metal
    10·2 answers
  • A golf ball is at rest on the grass. What must happen to cause the ball to move? A balanced net force must be applied
    8·1 answer
  • While a block slides forward 1.35 m, a force pulls back at a 135 direction, doing -17.8 J of work. what is the magnitude of the
    12·1 answer
  • A scallop forces open its shell with an elastic material called abductin whose elastic modulus is about 2.5× 10% N/m2 . If this
    5·1 answer
  • A mechanic pushes perpendicularly on the end of a 0.15m wrench. If the
    10·1 answer
  • What theory did Dalton propose to explain why the elements
    9·1 answer
  • Kayla and her friends are setting up chairs for a school play each row will contain the same number of chairs Kayla knows that t
    11·1 answer
  • A 2000 kg car moving at 100 km/h crosses the top of a hill with a radius of curvature of 100 m. What is the normal force exerted
    8·1 answer
  • What important component is still scarce for American manufacturers, which had 40 days' worth before the pandemic but only had a
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!